Abseiling into an ice cave, sleeping on an iceberg and escaping tidal waves... welcome to new BBC show Operation Iceberg!
A team of explorers have been on a ground-breaking expedition to the Arctic to investigate the unknown world of icebergs.
One of the most interesting things they found out was that a number of polar bears spent the Arctic summer living on floating icebergs, rather than on dry land.
Scientist Helen Czerski and diver Andy Torbet talk to us about glaciers and seeing polar bears!
Operation Iceberg begins on Tuesday 30 October at 9pm on BBC Two.